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实验和模拟计算均表明：在无注入种子激光的频移反馈Ｎｄ∶ＹＬＦ激光系统中，不存在软阈值，而当注入种子激光时，出现软阈值特性，实验还发现：随着种子激光功率增大，软阈值变得更加明显。
Experiments and simulations show that there is no soft threshold in the frequency-shifted Nd: YLF laser without injected laser, and soft threshold occurs when the laser is injected. The experiment also shows that with the increase of seed laser power Large, soft threshold becomes more apparent.